Wow, complete shocker. Incredible. The basket against the Pistons was amazing, of course. I remember him for making the top of the key shot against the Lakers in Game 4 of the 1985 Finals, tying the series. And the Lakers had yet beaten the Celtics and the series was going back to the Garden. Thankfully, the Lakers won Game 6.
RIP.

The Austin American Statesman is reporting it was cardiac arrest and WEEI in Boston just had Cedric Maxwell on and Maxwell said DJ weighed more than 300 pounds the last time he saw him. So, I am guessing heart attack.